Plate for pressure-filters.



A'To all whom it may concern:

oHaLEs WMRRILL; or LEAD, souTH DAKOTA.

PLATE Fon vranssURE-FILTRs.

Specication of Letters` Patent.

Patented Feb. 16, 1909.

Application filed November 23, 1906.' Serial No. 344,700.

Beit known that LCHARLES W. MERRILL,

. a citizen of the United States, and resident of Lead, county ofLawrence, State of South Dakota, have invented a new and usefulImprovement in Plates for Pressure-Filters, o f

p which the following is a specification.

My invention 'relates .to improvements in filter f plates for use inconnection with pressure l ters, and particularly to that class of,-ilter plates the surfaces of which are provided with corrugations ortruncated pyramids, which form grooved r bossed drainage surfaces. y

The particular object of the invention is so to arrange the corrugationsand pyramidsy that there will be no continuous line of weakness at anyone considerable portion of the lter' plate, and at' thesame time toeffect complete and continuous drainage from the diiferent drainagesurfaces.

The invention will be best understood by lreference' to the accompanyingsheet of" drawings, 1n whlch- Figure 1 is a plan view of the filterplate; Fig. 2 is a vertical crosssection on theline, A-A of- Fig. 1looking in the direction of the arrows; Fig. 3 is a verticallongitudinal section, partly broken away, on the lines- B-B of Fig. 1looking in the direction of the arrows, and Fig. l is a similar sectionon the line C-C of Fig. 1 looking `in the A direction of `the arrows.

which truncated` "Similar letters .refer to similar parts throughout theseveral views.

In the drawings, G represents the filter plate which Ais-of cast iron-orother convenient substance. l

H represents the inner surface of the filter late, as distinguished fromthemachined caring surface around its exterior, and I' representsthecorrugations or bosses 'which form the drainaofe surfaces.- These areflat .on top with beveled sides, as shownin Figs. .3 and 4, and they arearranged with refer- 'the press when assembled.

gations connected by transverse channels J, .the angles being in eachcase greater than 90, but any other grouping which'will permit the'corrugations to intersect eachother at such an angle may be employed.The. raised ribs R around the outer periphery of the inner main duct orcanal for the collection or distribution of li uid, fand are connectedby a port or ports'qP, with a main .channel or channelsl a runninglongitudinally through I claim'as my invention: A

1. A filter plate provided with a solid central web and c'orrugationsthereon broken at convenient points and so aggregated that any'straightgroove is shorter than the shortest interior surface dimensionof said plate.

2.' A filter plate provided with a solidy cen- Atral web andcorrugat-ions thereon intersecting at an angle of other than ninetydegrees and broken at convenient points by grooves each of which isshorter than the shortest interior surface dimension of said plate.

surface of the plate, form a 3. A filter plate provided with a solidcentral web and corrugations thereon so aggregatedas to form groups ofconcentric polygonsthe sides of which are intersected by drainagegrooves each of which is shorter than the shortest interior surfacedimension of said late.

4. A lter plate provided with corrugationsq thereonso aggregated as toform groups of concentric polygons, the sides of which are intersectedby vdrainage Grooves.

5. A filter plate provided with a solid central web and corrugationsthereon so aggregated as to form concentric octagons, the sides of whichare intersected by drainagev grooves, each of which is shorter than theshortest interior surface dimension of said plate.

46. A filter plate provided with a solid central web and corrugationsthereon so aggregated 'as to form polygons, the sides of which are sointersected by grooves as to insure complete drainage, each of which isshorter than the shortest interior surface dimension of said late.

7. A lter plate provided with a solid cen'- tral web and parallelcorrugations thereon so aggregated as to form concentric polygons, thesides of which are so intersected by grooves as to insure completedrainage,- each of which is shorter than the shortest interior `surfacedimension of said plate.

' aggregated as to form I'je/oncentrc octa ons,

8. A lter plate provided withv solid ceni 'tral Web and paralleloorrugatons thereon so A,presenceV of two witnesses, this 16th day of 10November 190,6.-

the sides of which'l are so vi'ntersete by Grooves as to insure completedrainage, each of which is shorter than; the shortest in teriol E-Witnesses: surface dimension of sand-plate.' 1 i S. MERRILL, Y Intestimony, that I claim the foregoing as v 1WVM.' HAMMOND, J r.

my invention, I have signed my name in CHARLES W. MERRILL.

